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Detection of Carbon Recombination Lines at Decameter Wavelengths in Some Galactic Objects

  • A. A. Golynkin
  • A. A. Konovalenko
Part of the Astrophysics and Space Science Library book series (ASSL, volume 163)

Abstract

The recombination lines of highly excited carbon atoms near 25 MHz were detected in the directions of DR 21, S140 and L 1407. The line intensity is about 10-3 of the background level, with the width varying between and 8 KHz and the line of sight radial velocity close to zero. Evaluating the physical parameters of the medium responsible for line formation we have obtained the electron number density in DR 21 and S 140 below 1 cm-3. The estimate for the cloud L 1407 is, with allowance for the data on the background continuum absorbtion, 0.05 to 0.1 cm-3 with an electron temperature of 10 to 20 K. The highly sensetive techniques of decameter band radio spectroscopy suggest way of detecting low density cold interstellar plasmas with ionized carbon in various galactic objects.

Keywords

Dust Cloud Recombination Line Antenna Beam Decameter Wavelength Galactic Background 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • A. A. Golynkin
    • 1
  • A. A. Konovalenko
    • 1
  1. 1.Institute of Radio Astronomy Academy of Sciences of the Ukrainian SSRKharkovUSSR

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